Egress Window Cost: The Window, the Well and the Digging

An egress window usually costs a few thousand dollars installed, because the price covers more than the window. Angi reports a national average of $4,236 from 760 projects, with most homeowners spending $2,723 to $5,881 per window (page updated August 31, 2026) ¹. Fixr reports a national average of about $3,500 and a typical range of $2,500 to $5,000, from as little as $900 for a prefabricated window above ground to about $10,000 for a custom window below ground with excavation and a window well (page updated August 29, 2025) ².

The spread comes from where the window goes. Swapping a window in an existing above-ground opening is mostly a window job. A new basement opening adds cutting through the foundation wall, digging outside, a window well and drainage, and that is where most of the money goes.

The two surveys side by side

The two figures are close but not the same, for ordinary reasons. Angi says its average comes from projects completed by pros on its platform ¹. Fixr says it draws on pricing databases, contractors and industry experts, without giving a sample size ². The pages were also updated a year apart, and each one groups the extras (wells, covers, drainage, permits) a little differently. Neither number is a quote for your house.

What an egress window is

"Egress" is the everyday name for what the model code calls an emergency escape and rescue opening. In the 2021 International Residential Code (IRC), Section R310 says basements, habitable attics and every sleeping room shall have at least one operable emergency escape and rescue opening, and that it must open to a public way or to a yard or court that leads to one (IRC R310.1) ³. The same section says the opening must work from inside the room without keys, tools or special knowledge ³.

The IRC is a model code. It applies in your town only as your state or city has adopted it, in the edition it chose and with any local amendments, so the locally adopted code governs your project. Your building department can tell you which edition and amendments apply.

The opening sizes in the model code

These are the numbers from Section R310 of the 2021 IRC (read the code text) ³:

• Net clear opening: not less than 5.7 square feet, or 5 square feet for a grade-floor opening (R310.2.1) ³.
• Minimum height and width of the opening: 24 inches high and 20 inches wide, measured as the result of normal operation of the window (R310.2.2) ³.
• Sill height: the bottom of the clear opening not more than 44 inches above the floor (R310.2.3) ³.
• Window well (area well): a horizontal area of not less than 9 square feet, with a projection and width of not less than 36 inches, large enough for the window to open fully (R310.4.1) ³.
• Ladder or steps: required in a well deeper than 44 inches, with ladder rungs at least 12 inches wide and spaced not more than 18 inches apart (R310.4.2) ³.

The opening size is the net clear opening, not the size of the window frame. A window can be large and still fall short if its sash only opens part of the way, so the way a window opens matters as much as its size. The types of windows guide explains how each style opens.

One clause matters for replacements. The 2021 IRC exempts a replacement window from the size rules in R310.2 when it is the manufacturer's largest standard size that fits the existing frame or rough opening, opens in the same way (or provides an equal or larger opening), and is not part of a change of occupancy (R310.5, code text) ³. Your local code may word this differently.

The three parts of the price

1. The window

The window itself is often the smaller part of the bill. Angi lists a 24-by-36-inch window that meets the minimum code size at $2,500 to $4,000 installed, a 30-by-48-inch window at $3,500 to $6,000, and a 36-by-60-inch window at $5,000 to $8,500 ¹. Fixr puts the window unit alone at $100 to $800 for a prefabricated window and $500 to $2,000 for a custom one ².

2. The well, cover and drainage

A below-grade window needs a well so the window can open and a person can climb out. Angi reports metal wells at $200 to $600, plastic at $250 to $800 and concrete at $750 to $2,500, with a cover adding $50 to $500 and a drain $500 to $2,000 ¹. Fixr lists well covers at $120 to $700 and an egress ladder at $150 to $225 ².

3. Cutting and digging

A new opening in a basement wall means cutting the foundation, adding a header, digging the well and hauling the soil away. Angi lists site preparation, including excavation, debris removal and delivery, at $500 to $2,000, and says complex jobs such as cutting thick concrete can take 40 hours or more of labor, well above the time it gives for a standard installation ¹. Fixr reports $2,000 to $5,000 for a basic prefabricated window installed below ground, against $500 to $1,000 above ground, because below-ground work means digging ². Ask whether a quote includes a structural engineer's letter if the building department wants one for a cut foundation.

Permits and inspections

A new egress opening changes the structure and the room's escape route, and Angi says most municipalities require a building permit for egress window installation ¹. Whether one applies to your job is set by your city or county, not by a national rule; the article on whether you need a permit to replace windows shows how differently cities handle it. Angi reports permit fees of $100 to $500 plus inspection fees of $50 to $300 ¹. Fixr reports permits at $50 to $200 ². A quote should say who pulls the permit and whether the fee is included.

What else moves the price

• Above grade or below grade. An above-grade opening skips the well and most of the digging ².
• Wall material. Angi names cutting through thick concrete as one of the things that adds time and expense ¹.
• Utilities in the way. Angi says rerouting plumbing or electrical lines makes a job more complex ¹.
• Finishing. Angi lists interior and exterior trim, drywall and paint at $300 to $1,200 ¹.
• Number of windows. Each extra opening brings its own window, well and cutting, and Angi lists installing several at once among the things that add time and expense ¹.

Questions to ask before you sign

• Does the price include the well, cover, drainage, ladder, permit and inspection?
• What is the net clear opening of the window you are quoting, in square feet and in inches?
• How far will the sill sit above the finished floor?
• Who pulls the permit, and is the fee in the quote?
• Is the installer licensed where your state or city licenses this work? The state pages, such as California and Arizona, link the board lookups.

The guide on how to choose a window installer covers the rest, and the window replacement cost guide explains how ordinary window replacements are priced. When you have a plan, you can compare quotes from window installers.

About these figures

• ¹ Reported: Angi national average ($4,236 from 760 projects), typical range per window, window size table, well, cover, drain, site preparation, finishing, labor hours (40 or more for complex jobs) and permit and inspection fees, page updated August 31, 2026, checked October 22, 2026.
• ² Reported: Fixr national average and typical range, low and high ends, window unit prices, below-ground installation, above- and below-ground installation, well cover, ladder and permit figures, page updated August 29, 2025, checked October 22, 2026.
• ³ Official record: 2021 International Residential Code Section R310 text (opening requirement, opening area, height, width, sill height, area well, ladder and replacement window clauses), checked October 22, 2026.